A method enables on-demand delivery of data from a plurality of heterogeneous external data sources to a data analytics tool. With a mapping of one or more identified data connectors, a no-code client query, as formulated in a first data model, is dynamically translated to one or more external queries formulated in one or more alternate data models of the heterogeneous external data sources. With the mappings of the one or more identified connectors, each response to the one or more external queries is reformulated from the one or more alternate data models to the first data model to yield one or more client query results objects. The client query results objects are sent to the data analytics tool.